AERCO Boiler Valve Controller (BVC) PRIOR to Serial-12-840-1 - Manual (Page 29)

OPERATION
29
3.4
15B
MANUAL VALVE CONTROL SCENARIOS
Two common scenarios are presented in the Scenario 1 and Scenario 2 subsections that follow.
NOTE
The MOV of a firing boiler cannot be manually overridden to the “CLOSED” position.
3.4.1 Scenario 1
In this scenario, depicted in Figure 14 below, Boilers #1 and #2 are firing and the corresponding
MOVs #1 and #2 are automatically opened. A boiler MOV can always be manually opened by
utilizing the “Valves” screen.
The scenario sequence is described as follows (See Figure 14).
1. From the Main screen press the “VALVES” touch screen button (Figure 14 – Screen1).
2. This action displays Screen 2 where either the “VALVES 1-2” or “VALVES 3-4” screens may
be selected by pressing their corresponding area of the touch screen. The user is now
brought to either the “VALVE 1-2” screen (Screen 3) or the “VALVES 3-4” screen (Screen
4). If the “BACK” touch screen button was pressed instead, the user would have navigated
back to the Main screen.
3. On the “VALVES 1-2” screen (Screen 3) the user cannot effect any change because those
boilers are assumed to be firing in this particular scenario. The two valves (Valve # 1 and
Valve # 2) are already in the “OPEN” position and cannot be manually closed while their
respective boilers are firing. Pressing the “BACK” touch screen button returns the user to
Screen 2 where the user may either choose to select the “VALVES 3-4” screen (Screen 4)
or simply press the “BACK” touch screen button and return to the Main screen.
4. If the user went to screen 4 instead, either Valve #3 or Valve #4 may be manually opened
since their respective boilers are not currently firing.
5. If the user navigated back to the Main screen the user may now choose to press the
“TIMER” touch screen button and set the boiler valve delay time in effect before the valves
can be closed.